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Jacinta is collecting dimes everyday. She collected 1 dime on the first day, 2 dimes on the second day, and 4 dimes on the third day. She continues this pattern for an indefinite amount of time.

Which rule models this situation?

 

an=−2+a n-1

an=−2n-1

an=2n-1

an=2⋅an+1

 Jan 8, 2019

Best Answer 

 #1
avatar+18965 
+2

The third one......test it by putting in values for the n

n=1    she saves 1 dime    2^(1-1) = 2^0 =1       Check!

day2 n=2     she saves 2 dimes    2^(2-1) = 2^1 = 2    check !

day3 n=3 she saves 4 dimes       2^(3-1) = 2^2 = 4     check!

etc

etc.

 Jan 8, 2019
 #1
avatar+18965 
+2
Best Answer

The third one......test it by putting in values for the n

n=1    she saves 1 dime    2^(1-1) = 2^0 =1       Check!

day2 n=2     she saves 2 dimes    2^(2-1) = 2^1 = 2    check !

day3 n=3 she saves 4 dimes       2^(3-1) = 2^2 = 4     check!

etc

etc.

ElectricPavlov Jan 8, 2019

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